如何使用正则表达式

Question

“我正在尝试使用正则表达式删除以小写字母开头的单词，但没有得到所需的输出。”

我的输入是“适用于此法案，并已成为Illiam B GEISSLER的一部分”

import re 
text = "apply to this bill and are made a part thereof Illam B GEISSLER"  
result = re.sub(r"\w[a-z]", "", text)  
print(result) 

我得到的输出为“ I B GEISSLER” 要求输出为“ Illiam B GEISSLER”

Answer 1

尝试找到模式INSTALLED_APPS = [ 'django.contrib.admin', 'django.contrib.auth', 'django.contrib.contenttypes', 'django.contrib.sessions', 'django.contrib.messages', 'django.contrib.staticfiles', 'rest_framework', 'django_mysql', ] ，并替换为空字符串：

\b[a-z]+\s*

此打印：

text = "apply to this bill and are made a part thereof Illam B GEISSLER"  
result = re.sub(r'\b[a-z]+\s*', "", text).strip()
print(result)

模式Illam B GEISSLER 背后的想法是，它仅与两侧都被单词边界包围的整个单词相匹配。请注意，我们调用\b[a-z]+\s*删除所有剩余的空格。

另一个微妙之处是该模式删除了每个匹配的小写字母的RHS上的所有空格。这是为了使文本可读，例如，某些匹配的单词应位于某些不匹配的单词之间：

strip

这可以正确打印：

text = "United States Of a bunch of states called America"  
result = re.sub(r'\b[a-z]+\s*', "", text).strip()
print(result)

Answer 2

您可以搜索大写单词 在链接中可以找到示例

Regex - finding capital words in string

Answer 3

尝试一下

import re
text = "apply to this bill and are made a part thereof Illam B GEISSLER"
result = re.sub(r"(\b[a-z]+)", '', text).strip()
print(result)

输出

Illam B GEISSLER

Answer 4

此表达式也可能起作用：

\s*\b[a-z][a-z]*

Demo 1

测试

import re

regex = r"\s*\b[a-z][a-z]*"

test_str = "apply to this bill and are made a part thereof Illam B GEISSLER apply to this bill and are made a part thereof Illam B GEISSLER"

subst = ""

# You can manually specify the number of replacements by changing the 4th argument
result = re.sub(regex, subst, test_str, 0, re.MULTILINE)

if result:
    print (result)

或者这一个：

([A-Z].*?\b\s*)

测试

import re

regex = r"([A-Z].*?\b\s*)"
test_str = "apply to this bill and are made a part thereof Illam B GEISSLER apply to this bill and are made a part thereof Illam B GEISSLER"
print("".join(re.findall(regex, test_str)))

输出

Illam B GEISSLER Illam B GEISSLER

Demo 2